A control method for erecting main cables based on aerial spinning method of suspension bridge

Abstract

The present invention provides a control method for erecting the main cable based on the aerial spinning method of a suspension bridge. During the aerial spinning process, a host computer and a monitoring system are connected in real-time communication to realize monitoring of the construction site. The tension device of the unwinding mechanism unwinding or the winding mechanism winding process is controlled in real time by the lower computer, and the tension measuring devices on both sides of the tension tower are monitored at the same time, and compared with the tension setting value to realize constant tension control of the main cable steel wire, and the real-time winding diameter of the winding mechanism is measured by the winding diameter measuring device, and the angular velocity is converted into the linear velocity by the lower computer, and the length of the winding mechanism winding is obtained by the length measuring device. The present invention uses the host computer to monitor in real time, and the lower computer monitors the operating status of each device in real time, and controls and adjusts according to the measurement data of each sensor, and realizes the real-time interaction between the integrated control and the construction site operation through the visual monitoring system, thereby improving the automation and operability of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of linkage control of an aerial spinning system of a suspension bridge, and in particular relates to a control method for erecting a main cable based on an aerial spinning method of a suspension bridge. Background Art

[0002] The main cable installation method of modern suspension bridges in my country basically adopts the prefabricated parallel strand (PPWS) method. This process is to form a parallel steel wire bundle with a regular hexagonal cross-section by combining several steel wire ropes, wrapping them with fiber strength belts to form parallel steel wire strands, installing anchor heads at both ends, and then transporting them to the construction site. After on-site erection, the main cable is formed. The strands are manufactured in advance in the factory and then transported to the site for direct erection. With the increase in the span of the suspension bridge, the increase in the length of the main cable strand will cause difficulties in the coiling and transportation of the strands. Even for some conventional span suspension bridges, the cable strands will be difficult to transport due to the bridge site problem.

[0003] The Aerial Spinning (AS) method for suspension bridges is to transport rolled steel wires to the construction site, use a winch to drive the spinning machine, spin the steel wires into strands of steel wire bundles, and finally process them into two main cables. That is, the steel wires are transported to the construction site, and then "assembled into a whole" to form the main cables. The successful application of the "Aerial Spinning Method" can not only greatly reduce the transportation pressure of the project and reduce the difficulty of construction of suspension bridges in difficult mountainous areas, but also has important significance for meeting the future construction needs of super-large span suspension bridges and opening up the international market for suspension bridge construction. However, the centralized control system of the AS method has not yet been deeply studied. Summary of the invention

[0004] The purpose of the present invention is to provide a control method for erecting a main cable based on the aerial spinning method of a suspension bridge, so as to overcome the above-mentioned technical problems existing in the prior art.

[0005] To this end, the technical solution provided by the present invention is as follows:

[0006] A control method for erecting a main cable based on the aerial spinning method of a suspension bridge. During the aerial spinning process, a host computer and a monitoring system are connected in real-time communication to realize monitoring of the construction site. A lower computer monitors the steel wire tension data measured by a tension measuring device installed on both sides of a tension tower in real time, and after comparing the steel wire tension data with a tension setting value, controls the tension device in the process of unwinding a wire or winding a wire to adjust the tension force, so as to realize constant tension control of the main cable steel wire.

[0007] The lower computer receives the real-time winding diameter of the winding mechanism through the winding diameter measuring device, and converts the winding angular velocity of the winding mechanism into the linear velocity according to the real-time winding diameter, and the lower computer obtains the winding length of the winding mechanism through the length measuring device.

[0008] The constant tension control process of the main cable steel wire is as follows: the lower computer measures the tension value of the steel wire in the process of unwinding the wire by the unwinding mechanism or winding the wire by the winding mechanism in real time through the tension measuring device, outputs the signal to the unwinding proportional valve or the winding proportional valve in a PID adjustment mode, and continuously adjusts the unwinding tension or the winding tension to the set value through the tension device, thereby realizing the constant tension of the main cable steel wire.

[0009] During the process of unwinding the wire by the unwinding mechanism or winding the wire by the winding mechanism, the lower computer sends a signal to the unwinding inverter of the unwinding mechanism or the winding inverter of the winding mechanism, so that the unwinding motor or the winding motor adopts a constant torque control method to achieve constant tension of the wire during the change of the winding diameter.

[0010] The unwinding mechanism includes an unwinding motor, a reel, an unwinding frequency converter, an unwinding proportional valve, a tensioning device and an unwinding brake disc. The tensioning device is installed between the unwinding motor and the reel, the unwinding motor is connected to the reel through a rotating shaft, the unwinding proportional valve is connected to the tensioning device, the unwinding brake disc is installed on the reel, the unwinding frequency converter is electrically connected to the unwinding motor, and the unwinding motor, the unwinding frequency converter, the unwinding proportional valve and the unwinding brake disc are all connected to the electrical signal of the lower machine.

[0011] The winding mechanism includes a winding motor, a second reel, a winding proportional valve, a winding frequency converter, a second tensioning device, a wire arranging motor, a wire arranging frequency converter and a winding brake disc. The tensioning device is installed between the winding motor and the second reel. The winding proportional valve is connected to the second tensioning device. The winding motor is connected to the second reel through a rotating shaft. The output shaft of the wire arranging motor is connected to the rotating shaft. A wire arranging device is installed on the rotating shaft. The wire arranging device moves linearly along the rotating shaft. The steel wire passes through the wire arranging device and is wound around the second reel. The winding frequency converter is electrically connected to the winding motor. The wire arranging frequency converter is electrically connected to the wire arranging motor. The winding motor, the winding proportional valve, the wire arranging motor, the wire arranging frequency converter and the winding brake disc are all connected to the lower machine electrical signal.

[0012] The tension measuring device comprises an unwinding tension sensor and a winding tension sensor. The winding tension sensor is arranged between the winding mechanism and the coiled steel wire. There are two unwinding tension sensors, which are respectively arranged on both sides of the tension tower.

[0013] The length measuring device comprises a meter wheel, a proximity switch 1 and a proximity switch 2. The meter wheel moves between the proximity switch 1 and the proximity switch 2. The meter wheel, the proximity switch 1 and the proximity switch 2 are all connected to the lower machine electrical signal.

[0014] The monitoring system is connected to the upper machine by electrical signals. The monitoring system includes a plurality of cameras, which are respectively installed at the upstream and downstream of the suspension bridge and on a spinning wheel used for aerial spinning.

[0015] The lower computer is a PLC controller.

[0016] The upper computer and the lower computer are connected via a switch electrical signal, and the switch electrical signal is connected to a touch screen.

[0017] The beneficial effects of the present invention are:

[0018] The control method for laying the main cable based on the aerial spinning method of the suspension bridge provided by the present invention uses a host computer for real-time monitoring, and a slave computer for real-time monitoring of the operating status of each device, and performs control and adjustment according to the measurement data of each sensor. On the basis of realizing mechanization, systematization and automation, it further improves and enhances the application of automation in various types of equipment, forms a linkage mechanism with the integrated control room, and realizes real-time interaction between integrated control and construction site operations through a visual monitoring system, thereby improving the automation and operability of the system.

[0019] The lower computer of the present invention adopts a PLC controller. During the unwinding process of the unwinding system, the tension sensor measures the actual tension. The PLC outputs a signal to the pneumatic proportional control valve in a PID adjustment mode to continuously adjust the unwinding tension and the winding tension to form a closed-loop control and achieve constant tension.

[0020] The present invention adopts a two-level control structure of PLC and touch screen. The touch screen and PLC communicate through an Ethernet interface. The PLC is used to collect and control data on the equipment in the entire system, and control commands are issued to the system equipment through the human-machine interface of the touch screen. At the same time, the operating status information of each device in the system is intuitively and dynamically displayed on the touch screen.

[0021] The following will provide further detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a principle block diagram of the present invention;

[0023] Figure 2 This is the wire winding principle diagram of the winding mechanism;

[0024] Figure 3 It is a schematic diagram of wire unwinding of the unwinding mechanism of the present invention.

[0025] In the figure: 1. Coil wire; 2. Splicing device; 3. Winding tension sensor; 4. Wire arrangement device; 5. Meter wheel; 6. Reel diameter measuring device; 7. Upper computer; 8. Switch; 9. Lower computer; 10. Winding motor; 11. Winding frequency converter; 12. Unwinding proportional valve; 13. Unwinding motor; 14. Wire arrangement frequency converter; 15. Wire arrangement motor; 16. Tensioning device 1; 17. Tensioning device 2; 18. Winding proportional valve; 19. Winding brake disc; 20. Proximity switch 1; 21. Length measuring device; 22. Winding tension sensor; 23. Unwinding tension sensor; 24. Unwinding brake disc; 25. Pulley; 26. Tension tower; 27. Counterweight; 28. Proximity switch 2; 29. ​​Touch screen. DETAILED DESCRIPTION

[0026] The following is an explanation of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0028] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0029] Embodiment 1:

[0030] This embodiment provides a control method for erecting main cables based on the aerial spinning method of a suspension bridge. During the aerial spinning process, the upper computer 7 and the monitoring system are connected in real time for monitoring the construction site.

[0031] The lower computer 9 monitors the steel wire tension data measured by the tension measuring devices installed on both sides of the tension tower 26 in real time, and after comparing the steel wire tension data with the tension setting value, controls the tension device in the process of unwinding the wire or winding the wire to adjust the tension force, so as to realize the constant tension control of the main cable wire;

[0032] The lower computer receives the real-time winding diameter of the winding mechanism through the winding diameter measuring device 6, and converts the winding angular velocity of the winding mechanism into a linear velocity according to the real-time winding diameter, and the lower computer 9 obtains the winding length of the winding mechanism through the length measuring device 21.

[0033] The control method for laying the main cable based on the aerial spinning method of the suspension bridge provided by the present invention uses the upper computer 7 to monitor in real time, and the lower computer 9 to monitor in real time the operating status of each device, and performs control and adjustment according to the measurement data of each sensor. On the basis of realizing mechanization, systematization and automation, it further improves and enhances the application of automation in various types of equipment, forms a linkage mechanism with the integrated control room, and then realizes real-time interaction between integrated control and construction site operations through the visual monitoring system, thereby improving the automation and operability of the system.

[0034] Embodiment 2:

[0035] On the basis of Example 1, this embodiment provides a control method for erecting the main cable based on the aerial spinning method of the suspension bridge, and the constant tension control process of the main cable steel wire is as follows: the lower computer 9 measures the tension value of the steel wire in the process of unwinding the wire by the unwinding mechanism or winding the wire by the winding mechanism in real time through the tension measuring device, and outputs a signal to the unwinding proportional valve 12 or the winding proportional valve 18 in a PID adjustment manner, and continuously adjusts the unwinding tension or the winding tension to the set value through the tension device, thereby achieving constant tension of the main cable steel wire.

[0036] Taking the wire unwinding process as an example, during the wire unwinding process of the unwinding system, the tension sensor measures the actual tension, and the PLC outputs a signal to the pneumatic proportional control valve in a PID control mode, continuously adjusting the unwinding tension and winding tension to form a closed-loop control and achieve constant tension.

[0037] Embodiment 3:

[0038] On the basis of Example 1, this embodiment provides a control method for erecting the main cable based on the aerial spinning method of a suspension bridge. During the unwinding mechanism unwinding or the winding mechanism winding process, the lower computer 9 sends a signal to the unwinding inverter of the unwinding mechanism or the winding inverter 11 of the winding mechanism, so that the unwinding motor 13 or the winding motor 10 adopts a constant torque control method to achieve constant tension of the wire during the change of the winding diameter.

[0039] During the process of unwinding the wire by the unwinding mechanism or winding the wire by the winding mechanism, the winding diameter changes. After the winding diameter changes, the tension will also change. Therefore, the real-time winding diameter of the winding mechanism is measured by the winding diameter measuring device 6 and the measurement data is sent to the lower computer 9 in real time. The lower computer 9 sends a signal to the unwinding frequency converter or the winding frequency converter 11, so that the unwinding motor 13 or the winding motor 10 adopts a constant torque control method to achieve constant tension of the wire during the change of the winding diameter.

[0040] Embodiment 4:

[0041] On the basis of Example 1, this embodiment provides a control method for erecting the main cable based on the aerial spinning method of a suspension bridge, wherein the unwinding mechanism includes an unwinding motor 13, a reel 1, an unwinding frequency converter, an unwinding proportional valve 12, a tensioning device 16 and an unwinding brake disc 24, wherein the tensioning device 16 is installed between the unwinding motor 13 and the reel 1, the unwinding motor 13 is connected to the reel 1 through a rotating shaft, the unwinding proportional valve 12 is connected to the tensioning device 16, the unwinding brake disc 24 is installed on the reel 1, the unwinding frequency converter is electrically connected to the unwinding motor 13, and the unwinding motor 13, the unwinding frequency converter, the unwinding proportional valve 12 and the unwinding brake disc 24 are all electrically connected to the lower computer 9.

[0042] The aerial spinning method is a process of hanging a steel wire with a diameter of 5-7mm on a spinning wheel, going back and forth between the anchors on both sides of the bridge, and using the steel wire as a unit to erect the main cable. As the spinning wheel circulates back and forth, the steel wire is drawn out from the reel. In this process, when the tension measuring device measures that the steel wire tension is less than the set value, the lower computer 9 sends a signal to the unwinding proportional valve 12, so that the tensioning device 16 increases the tension, and then performs tension testing and adjustment until the set tension value is reached, thereby maintaining the constant tension of the steel wire. Among them, the unwinding inverter is used to achieve a change in the reel diameter by changing the power supply frequency while maintaining a constant tension.

[0043] like Figure 3 As shown, the steel wire released by the unwinding mechanism passes through a pulley group 25 with a counterweight 27 hung in the center of the tension tower 26, in order to maintain a constant tension during the erection process. The driving speed of the unwinding mechanism is automatically controlled according to the height of the counterweight 27. By installing a rope puller on the central pulley 25, the rope puller is connected to the lower computer 9 by electrical signals, and the height of the counterweight 27 can be known.

[0044] Embodiment 5:

[0045] On the basis of Example 1, this embodiment provides a control method for erecting the main cable based on the aerial spinning method of a suspension bridge, wherein the winding mechanism includes a winding motor 10, a reel 2, a winding proportional valve 18, a winding frequency converter 11, a tensioning device 2 17, a cable arrangement motor 15, a cable arrangement frequency converter 14 and a winding brake disc 19, wherein the tensioning device is installed between the winding motor 10 and the reel 2, the winding proportional valve 18 is connected to the tensioning device 2 17, and the winding motor 10 is connected to the reel 2. The output shaft of the wire arrangement motor 15 is connected to the shaft through a rotating shaft, and a wire arrangement device 4 is installed on the shaft. The wire arrangement device 4 moves linearly along the shaft, and the steel wire is wound on the reel 2 after passing through the wire arrangement device 4. The winding inverter 11 is electrically connected to the winding motor 10, and the wire arrangement inverter 14 is electrically connected to the wire arrangement motor 15. The winding motor 10, the winding proportional valve 18, the wire arrangement motor 15, the wire arrangement inverter 14 and the winding brake disc 19 are all connected to the lower computer 9 by electrical signals. Figure 1 shown.

[0046] like Figure 2 As shown, the winding mechanism is used to wind the coiled steel wire 1 made in the factory on the reel 2. After the winding operation is completed, it is transferred to the unwinding mechanism, so that the steel wire can be released at a high speed and stably through the unwinding mechanism while maintaining a certain tension during the erection process. Due to the manufacturing restrictions of the coiled steel wire 1 (steel wire rod), the small coiled steel wire needs to be connected by the splicing device 2 and wound on the unwinding mechanism through the winding mechanism, and the wire is unwound through the unwinding mechanism.

[0047] The steel wires are connected by a connecting sleeve of an extrusion joint, and a hydraulic sleeving machine is used as a splicing device 2 for extrusion connection when the rolled steel wires are wound on a coil.

[0048] When the tension measurement value does not meet the requirement, the lower computer 9 sends a signal to the winding proportional valve 18, and adjusts it through the tensioning device 2 17. During the winding process of the winding mechanism, in order to make the steel wire evenly wound on the reel 2, the wire arrangement motor 15 drives the wire arrangement device 4 to make reciprocating linear motion along the rotating shaft, so that the steel wires are arranged neatly. When the winding speed needs to be adjusted, the lower computer 9 sends a signal to the wire arrangement inverter 14 to meet the winding speed requirements. When the winding is completed or the wire splicing needs to be stopped, the lower computer 9 sends a signal to the winding motor 10 and the winding brake disc 19 to stop the winding.

[0049] Embodiment 6:

[0050] On the basis of Example 1, this embodiment provides a control method for erecting the main cable based on the aerial spinning method of the suspension bridge, wherein the tension measuring device comprises an unwinding tension sensor 23 and a winding tension sensor 223, wherein the winding tension sensor 223 is arranged between the winding mechanism and the coiled steel wire 1, and the unwinding tension sensors 23 are two, which are arranged on both sides of the tension tower 26 respectively. Figure 3 shown.

[0051] A certain tension needs to be maintained when the winding mechanism is winding the wire or the unwinding mechanism is unwinding the wire. The lower computer 9 monitors the wire tension in real time through the winding tension sensor 223 and the unwinding tension sensor 23, and then makes real-time adjustments through the tensioning device 2 17 and the tensioning device 1 16 to ensure constant tension.

[0052] Embodiment 7:

[0053] On the basis of Example 1, this embodiment provides a control method for laying the main cable based on the aerial spinning method of a suspension bridge, wherein the length measuring device 21 includes a meter wheel 5, a proximity switch 1 20 and a proximity switch 2 28, wherein the meter wheel 5 moves between the proximity switch 1 20 and the proximity switch 2 28, and the meter wheel 5, the proximity switch 1 20 and the proximity switch 2 28 are all connected to the lower computer 9 by electrical signals.

[0054] The meter wheel 5 moves along the steel wire. When the meter wheel 5 approaches the proximity switch 20, the proximity switch 20 sends a pulse signal to the lower computer 9. The meter wheel 5 moves back and forth. When it moves close to the proximity switch 28, the proximity switch 28 sends a pulse signal to the lower computer 9. The meter wheel 5 moves back and forth. The lower computer 9 can calculate the length of the steel wire according to the interval and number of the received pulse signals and the speed of the meter wheel 5 and the speed of the steel wire.

[0055] The lower computer 9 is a PLC controller. The PLC and the local module cooperate with the detected status and data to perform corresponding actions and complete the operation of the equipment. After receiving the command, the PLC gives a feedback signal. If the correct feedback signal is not received within the predetermined time, the monitoring program gives a clear alarm signal for the operator to check and make further decisions. When necessary, the operation station can be used to pause, resume operation or operate a single device.

[0056] In this embodiment, the PLC controller adopts the Japanese Mitsubishi FX5U series PLC. The host computer 7 system adopts Advantech IPC-610L industrial computer, uses KingView software, has a full Chinese operation interface, and is user-friendly.

[0057] The monitoring system is connected to the host computer 7 by electrical signals. The monitoring system includes a plurality of cameras, which are respectively installed upstream and downstream of the suspension bridge and on a spinning wheel for aerial spinning.

[0058] The cameras include fixed-focus cameras and zoom cameras. Since the equipment is outdoors, a waterproof cover is provided. During implementation, a WiFi network is deployed on site to provide full coverage, so the fixed-focus cameras and zoom cameras are directly connected to the network hard disk recorder through the WiFi network to achieve video signal transmission. The wireless bridge access method is adopted. Considering that the installation locations of the cameras are relatively scattered, two directional AP base stations DH-PFM880E are fixed at the remote end, and one AP transmitter DH-PFM881 is deployed at each mobile camera end to achieve long-distance data transmission. The WiFi camera is equipped with a 4G router, which is connected to the hard disk recorder through 4G to achieve normal storage of the video.

[0059] The upper computer 7 and the lower computer 9 are connected via a switch 8 , and the switch 8 is connected to a touch screen 29 via an electrical signal.

[0060] The lower computer 9PLC is used to collect and control data of the equipment in the whole system, and control commands are issued to the system equipment through the human-machine interface of the touch screen 29. At the same time, the operating status information of each device in the system is intuitively and dynamically displayed on the touch screen 29. The touch screen 29 and PLC communicate through the Ethernet interface.

[0061] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A control method for erecting a main cable based on the aerial spinning method of a suspension bridge, characterized in that: During the aerial spinning process, the upper computer and the monitoring system are connected in real time to monitor the construction site; the lower computer monitors the wire tension data measured by the tension measuring devices installed on both sides of the tension tower in real time, and after comparing the wire tension data with the tension setting value, controls the tension device during the unwinding mechanism unwinding or the winding mechanism winding process to adjust the tension force, so as to achieve constant tension control of the main cable wire; The lower computer receives the real-time coil diameter of the winding mechanism through the coil diameter measuring device, and converts the winding angular velocity of the winding mechanism into the linear velocity according to the real-time coil diameter, and the lower computer obtains the length of the winding mechanism through the length measuring device; The constant tension control process of the main cable steel wire is as follows: the lower computer measures the tension value of the steel wire in the process of unwinding the wire by the unwinding mechanism or winding the wire by the winding mechanism in real time through the tension measuring device, outputs the signal to the unwinding proportional valve or winding proportional valve in the PID adjustment mode, and continuously adjusts the unwinding tension or winding tension to the set value through the tension device, thereby realizing the constant tension of the main cable steel wire; During the process of unwinding the wire by the unwinding mechanism or winding the wire by the winding mechanism, the lower computer sends a signal to the unwinding inverter of the unwinding mechanism or the winding inverter of the winding mechanism, so that the unwinding motor or the winding motor adopts a constant torque control method to achieve constant tension of the wire during the change of the winding diameter.

2. A control method for erecting main cables based on the aerial spinning method of a suspension bridge according to claim 1, characterized in that: The unwinding mechanism includes an unwinding motor, a reel, an unwinding frequency converter, an unwinding proportional valve, a tensioning device and an unwinding brake disc. The tensioning device is installed between the unwinding motor and the reel, the unwinding motor is connected to the reel through a rotating shaft, the unwinding proportional valve is connected to the tensioning device, the unwinding brake disc is installed on the reel, the unwinding frequency converter is electrically connected to the unwinding motor, and the unwinding motor, the unwinding frequency converter, the unwinding proportional valve and the unwinding brake disc are all connected to the electrical signal of the lower machine.

3. The control method for erecting the main cable based on the aerial spinning method of a suspension bridge according to claim 1 is characterized by: The winding mechanism includes a winding motor, a second reel, a winding proportional valve, a winding frequency converter, a second tensioning device, a wire arranging motor, a wire arranging frequency converter and a winding brake disc. The tensioning device is installed between the winding motor and the second reel. The winding proportional valve is connected to the second tensioning device. The winding motor is connected to the second reel through a rotating shaft. The output shaft of the wire arranging motor is connected to the rotating shaft. A wire arranging device is installed on the rotating shaft. The wire arranging device moves linearly along the rotating shaft. The steel wire passes through the wire arranging device and is wound around the second reel. The winding frequency converter is electrically connected to the winding motor. The wire arranging frequency converter is electrically connected to the wire arranging motor. The winding motor, the winding proportional valve, the wire arranging motor, the wire arranging frequency converter and the winding brake disc are all connected to the lower machine electrical signal.

4. A control method for erecting main cables based on the aerial spinning method of a suspension bridge according to any one of claims 1 to 3, characterized in that: The tension measuring device comprises an unwinding tension sensor and a winding tension sensor. The winding tension sensor is arranged between the winding mechanism and the coiled steel wire. There are two unwinding tension sensors, which are respectively arranged on both sides of the tension tower.

5. A control method for erecting main cables based on the aerial spinning method of a suspension bridge according to any one of claims 1 to 3, characterized in that: The length measuring device comprises a meter wheel, a proximity switch 1 and a proximity switch 2. The meter wheel moves between the proximity switch 1 and the proximity switch 2. The meter wheel, the proximity switch 1 and the proximity switch 2 are all connected to the lower machine electrical signal.

6. A control method for erecting main cables based on the aerial spinning method of a suspension bridge according to any one of claims 1 to 3, characterized in that: The monitoring system is connected to the upper machine by electrical signals. The monitoring system includes a plurality of cameras, which are respectively installed at the upstream and downstream of the suspension bridge and on a spinning wheel used for aerial spinning.

7. A control method for erecting main cables based on the aerial spinning method of a suspension bridge according to any one of claims 1 to 3, characterized in that: The lower computer is a PLC controller.

8. A control method for erecting main cables based on the aerial spinning method of a suspension bridge according to any one of claims 1 to 3, characterized in that: The upper computer and the lower computer are connected via a switch electrical signal, and the switch electrical signal is connected to a touch screen.

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